John bandolph haed



(No Model.)

J. R. HARD.

VIBRATING RHEOTOMB.

Patented OGt. 18, 1887.

INVENTORI II BEE WITNESSES:

N PETERS, Pholo'ljlhognpher. wnm m. D. c,

UNITED STATES PATENT OEEIcE.

JOHN RANDOLPH HARD, OF NEW' YORK, N. Y.

VIBRATING RH EOTOME.

SPECIFICATION forming part; of Letters Patent No. 371,755, dated October 18, 1887.

Serial No. 241,259. (No model.)

To all whom it may concern:

Be it known that I, J OHN RANDOLPH HARD, a citizen of the United States, and a resident of the city, county, and State of New York, haveinvented certain new and useful Improvements in Electrical Apparatuses, of which th following is a specification. 4

My invention relates to improvements in electrical apparatuses generally, but especially in those designed'for medical use in which a rheotome is employed.

The object of my invention is in part to provide an improved means of holding the vibrating spring of the rheot'ome; in part to provide an improved mounting or holder for the contact-screw, whereby it may be conveniently adjusted with reference to the spring; in part to provide an improved binding-post, whereby conductors, either in the nature of flexible or tinsel cord'or in the nature of stiff thick wires, may be clamped, andin part.

to provide an improved coupling especially adapted for coupling conductors in the nature of flexible or tinsel cord or very fine wire.

My invention will be fully described hereinafter, and its novel features carefully defined in the claims.

In the drawings which serve to illustrate my invention, Figure 1 is a plan of an electrical apparatus embodying my improvements,

enough of the apparatus being shown to illustrate the complete application of my invention thereto. Fig. 2 is a side elevation of the said apparatus. Fig. 8 is a longitudinal axial section of the post that holds the vibrating spring of the rheotome, the section being taken in the plane indicated by line 3 8 in Fig. 2. Figs. 4 and 4? are sectional elevations of the bindingpost, illustrating its two applications. Fig. 5 is a sectional elevation of the post in which the contact-screw is mounted. Fig. 6 illustrates a slight modification of the post shown in Fig. 5.

Referring to Figs. 1 and 2, A is the base on which the parts are mount-ed. This will usually be of hard rubber, but not necessarily so.

13 is the electromagnet. O is the armature. O is the vibrating spring carrying the armature, and D is the post in which the spring 0* is mounted. I make the armature O and spring C from one piece of rolled iron, preferably,

screw, 6.

the piece being thinned down to form the spring. The head forming the armature is elongated. I mount the spring in a post, D, comprising a body, 1, (see Fig. 3,) axially slitted at its upper part to receive the spring O and provided with a conical screw, 2, and a screw-cap, 3. When the spring is inserted and adj usted,the screw-cap 8 is screwed down. This clamps the jaws or checks of the post on the spring and holds it firmly. The elongated armature enables me to shorten or lengthen the spring by sliding it along in the slot in the post D, and thus make it stiffer or weaker, as desired, whereby the rapidity of its vibra tion is varied. I usually set a strip of platinum, c, in or on the face of the spring to contact with the platinum tip of the contactscrew.

E is the contact-screw, and e a platinum tip therein or thereon. This screw is mounted in a post, F, the construction of which is best illustrated in Fig. 5. The base 4 of this post has a screw-threaded socket, 5, to receive a This screw has a head, 7, provided with a screw-threaded transverse hole to receive the contact-screw E,and an axial slit, 8,

which divides this hole longitudinally." At

may be raised or lowered in order to adapt ity to the height of spring O and a swinging adjustment, the screw turning laterally on the axis of post F-as a center. This enables the screw to be set with its axis at any angle desired, within limits, with the face of the spring 0*. In Fig. 1 the full lines indicate one position of the screw and the dotted lines another and very different position. The advantages of a shifting contact will be understood without extended explanation. When the vertical and lateral adjustment is effected, the screw 6 may be secured against turning by the jamnut 11. \Vhen the tip of the contact-screw is properly adjusted up to the spring, the screw may be fixed against axial rotation by screw cap 10. This cap also serves to take up looseness from wear.

In lieu of the screw 6 and jam-nut 11, I may substitute for the screw a smooth pin, and for the jam-nut a set-screw. This is illustratedin Fig. 6, wherein 6 is the said smooth pin, fit ting snugly in a smooth axial socket in the base of the post, and 11 is the set screw. This construction avoids the necessity of rotation of the head 7 in effecting vertical adjustment of the contactscrew.

I have called the contact part E a screw, and it will be a screw by preference; but it might be a plain bar without screw-threads and capable of being slipped longitudinally through a hole in the head 7. The clampscrew at the top could be relied on to hold it firmly against slipping.

I will now describe the bindingpost G, referring particularly to Figs. i and 4 for details. 12 is the base of the post, which has a screw-threaded socket to receive a screw,12. This screw has a milled flange, 13, and above this a stem, 14, provided with a screw-thread, 15, and a conical tip, 16. In stem 14 is screwed a cap, 17, which has a milled flange, 18, and a hole or aperture in its crown to receive the end of atinsel cord, II. This cord is or may be of the usual kind, made up of very fine wires, with a braided covering of non-conducting material. The inner face of the crown of cap 17 is made conical, to correspond with the conical tip 16, substantiallyas represented. Fig. 4; shows the post as applied to clamping or binding a tinsel cord, H, electrically. To effect this, the end of the cord is passed through the aperture in the cap 17, which has been unscrewed to make room for it. The cap is then screwed down tightly, and this causes the conical tip 16 to enter the mass of wires, spread them, and clamp them tightly. This clamping may be effected by any one quickly and easily, and the contact of the tip with the greater part of the wires insures positive electrical contact. Besides this, the post presents a very neat and tasteful appearance. The braided covering of the cord will. also be housed and clamped, so as to avoid the unsightly fraying of the same. Fig. 4 shows the application of my bi ndingpost when employed for binding a still or thick conducting-wire, 11. Through thcbase 12 of the post I bore or form a hole, 19, to receive said wire, and when the wire is inserted screw 12 is driven down upon it to clamp it fast and provide the necessary electrical contact. Thus 1 provide a post capable of binding conductors of any kind at will. Y

My improved coupling I for tinsel cords or other llexible conductors is seen in elevation in Fig. 1, and with its end caps in section in Fig. 2. The principle on which its construction is based is the same that of the binding-post G, so far as the clamping of the cord is concerned.

20 is a metal stein wit 1 like conical tips, 21 21., formed on Ll'tS O.TtiEl11itiGS, with two like screw-threads, 22 22, formed on it, and with a central milled flange, 23. In each end of the stem 20 is screwed a clamping or binding cap, 24., which cap has an aperture in its crown to receive the end of the conductor and a coned inner face corresponding to the coned tip 21 on the stem. The tip 21 spreads and clamps the wires of the cord in the same manner as described with reference to the binding-post. My special construction of the coupling by screwing both caps 2% independently on the stem 20 enables me to construct a compact and tasteful coupling, and one whereby either wire may be detached from the coupling independently of the other. This cannot be effected in those couplings where two caps screw the one on the other.

The head 7 of post F, in which the contact screw E is mounted, is in the nature of a retatively-mounted nut, the axis of rotation of the nut being substantially at right angles to the axis of the screw.

I prefer a serew-cap as a clamp for the split posts D and F, but any screw-clamping device will serve.

Having thus described my invention, I claim- I 1. In an electrical apparatus, the combinacontact screw or part mounted in a head. or

nut, and said head or nut mounted rotatively on an axis at right angles to the axis of the said contact-screw, as set forth, whereby said screw may be made to contact with the spring at various points.

3. In an electrical apparatus, the combination,with the contact-screw E, of the post F, comprising the head 7, having a female screw to receive screw E, and a base,i,provided with a socket in which said head 7 is rotatively mounted, substantially as set forth.

1-. In an electrical apparatus, the combination, with the contactscrew, of the socketcd base at and the screw G,provided with a slitted head, 7,lsaid head having a female screw to re ecive the contactscrew, a conical screw,9,and a screw-cap, 10, substantially as set forth.

5. A binding-post for an electrical apparatus, consisting of a base, a stem, 14., provided with a screw, 15, and a conical tip, 16, and a screw-cap, 17, to screw onto said stem, and having an aperture in its crown to receive the conductor to be clamped, substantially as set forth.

6. A binding post for an electrical apparatus, consisting of a base, 12, provided with a hole, 19, to receive a conductor, and an axial IIO screw-threaded socket, a screw, 12*, to screw into said socket, a stem, 14, integral with screw 12, having a screw, 15, and a conical tip, 16, and a screw-cap, 17, to screw onto said stem, said screw-cap having an aperture in its crown to receive the end of a conductor, substantially as and for the purposes set forth.

7. A coupling for the conductors of an electrical apparatus, consisting of a metal stem, 20, having conical extremities and provided with two screw-threads, 22 22,and a flange,23, and two apertured binding-caps,24 24,having apertures in their crowns to receive the conductors, and female screws to engage, respectively, the screws on the stem, as set forth.

In witness whereof I have hereunto signed 15 my name in the presence of two subscribing witnesses.

JOHN RANDOLPH HARD.

\Vitnesses':

HENRY'CONNETT, J. D. CAI'LINGER. 

